Browsing by Subject "Energy efficient Ethernet"

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Open Access
Delay analysis of timer-based frame coalescing in energy efficient ethernet
(IEEE, 2013) Akar, N.
IEEE 802.3az, also known as Energy Efficient Ethernet (EEE), aims at reducing the energy consumption of an Ethernet link by placing it in sleep mode when the link is idle. Frame coalescing mechanism proposed for EEE is an effective means to increase the average idle time of the link, thus reducing the overhead stemming from sleep/wake transitions, but at the expense of increased frame delays. Therefore, it is imperative to quantify the energy-delay trade-off while employing frame coalescing. As opposed to existing delay models that focus only on the average delays, a simple but exact queuing model is introduced for timer-based frame coalescing to find the delay distribution when the frame arrival process is Poisson and frame lengths are generally distributed. An expression for average saving in power consumption is also provided.
Open Access
Model predictive control based adaptive frame coalescing in energy efficient ethernet
(IEEE, 2024-10-10) Gürsoy, Ömer; Akar, Nail
Frame coalescing is a well-established technique which manages the low power idle (LPI) mode supported by energy efficient Ethernet (EEE) interfaces. Frame coalescing enables EEE interfaces to remain in the LPI mode for a certain amount of time upon the arrival of the first frame (timer-based coalescing), or until a predefined amount of traffic accumulates in the transmission buffer (size-based coalescing). In this paper, we propose a novel open-loop dynamic coalescing technique, namely MPC-mean, that is based on model predictive control (MPC) and queuing theory. In contrast to conventional timer-based coalescing, the proposed method enables the update of the timer parameter repeatedly throughout the duration of the LPI mode of a single coalescing cycle by taking into account the arrival instants and sizes, of the frames waiting in the buffer. The proposed MPC-mean method attempts to minimize the energy consumption of the Ethernet link, under constraints on mean of the queue waiting time. The effectiveness of the algorithm is validated using simulations with synthetic and actual traffic traces.